PDF malware analysis — malicious · 03e4b6f0236ce5eb

MALICIOUS

PDF

69.0 KB Created: 2021-10-02 11:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: 38e16924bdd822bc4eaf46c6fa7e443b SHA-1: 31030bba3bef6e04ca17721200c81af559026e3b SHA-256: 03e4b6f0236ce5eba451d1f0d89cf7b42ae7235e985300c8d959909adbc355df

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external links, many hosted on compromised WordPress sites, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9993

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM

PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://medvor.ru/uplcv?utm_term=decompressive+cervical+laminectomy PDF link annotation
- http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f3efd39226---37985904691.pdfIn PDF document text
- http://northcity.rs/slike/files/67924993870.pdfIn PDF document text
- http://crawfordpoint-ca.seeninherd.com/files/redunotofanawofukemujaza.pdfIn PDF document text
- http://studiotecnicobergamaschi.it/userfiles/files/34774932784.pdfIn PDF document text
- http://gianniarnaudo.com/userfiles/files/ninijufap.pdfIn PDF document text
- https://accidentmatters.com/ckfinder/userfiles/files/88775292245.pdfIn PDF document text
- https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161432540b2009---zazemotogobemusizane.pdfIn PDF document text
- http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/15901675446.pdfIn PDF document text
- https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148d510ae304---96214951375.pdfIn PDF document text
- http://hzjksj.com/images/upload/File/11546085523.pdfIn PDF document text
- https://sabagdasarov.ru/upload/file/kitudamuzukiluxofutezut.pdfIn PDF document text
- http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614a067c044ca---nelarajaxidaviserukud.pdfIn PDF document text
- https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/9fjr27ghgp4uflf89i5vvft9im/22031843860.pdfIn PDF document text
- http://areaengineeringsrl.eu/userfiles/files/vavigubapojar.pdfIn PDF document text
- http://perevodvnegiloifond.ru/pict/file/juzilolodapowe.pdfIn PDF document text
- http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/78449528838.pdfIn PDF document text
- http://masan315.net/board/imagefile/file/9496328732.pdfIn PDF document text
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000aa88.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAA88	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000c29a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC29A	17236 bytes
SHA-256: `d9a526ed4c96f41b87c62d5889a7ad4d04960fc69a13d6b82c3ccb16b2a06107`
`font_02_sfnt_off0000ee84.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE84	10716 bytes
SHA-256: `9cac46b5603a8a139ba9e0dd05ad673e0eda4b593d6ebd965a039c4dd37d86fd`

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